Beijing Hydraulic Research Institute

Beijing, China

Beijing Hydraulic Research Institute

Beijing, China
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Liu L.,Beijing Normal University | Xu Z.-X.,Beijing Normal University | Huang J.-X.,Beijing Normal University | Huang J.-X.,Beijing Hydraulic Research Institute
Stochastic Environmental Research and Risk Assessment | Year: 2012

Long-term trend and abrupt changes of major climate variables in the Taihu Basin were investigated based on the mean, maximum and minimum air temperature, diurnal temperature range (DTR), precipitation, relative humidity and sunshine duration at six meteorological stations from 1954 to 2006. Results showed that the long-term trend for annual precipitation was not statistically significant during the past 53 years, but a wetter tendency was detected and the increasing centre for annual precipitation was located in the southeast of the study area. Mean air temperature has increased by 1.43°C, similar trends were also identified for maximum and minimum air temperature, which have increased by 1.06 and 1.54°C, respectively, while DTR exhibited a slight decreasing trend with a rate of about -0.09°C/(10 year). The annual mean relative humidity and sunshine duration exhibited a decreasing trend, with Kendall slope values of -0.99%/10 year and -7.797 h/10 year, respectively. Examination of long-range dependence showed that all climate variables exhibited strong persistence at annual scale except minimum air temperature. Detection of abrupt changes using nonparametric Mann-Kendall and Pettitt methods showed different results. Abrupt changes occurred in the 1980s and 2000s for annual precipitation using the nonparametric Mann-Kendall method, while no abrupt changes were detected using the Pettitt method. Abrupt changes of temperature and relative humidity took place in the early 1990s using the nonparametric Mann-Kendall method, which occurred in the late and mid 1980s using the Pettitt method, while abrupt changes of sunshine duration and DTR detected by two methods occurred in the similar period. The result will be helpful for local flood control and drought relief in urban planning and construction under future global climate change. © 2011 Springer-Verlag.

Fang H.,Tsinghua University | He G.,Tsinghua University | Wang L.,Beijing Hydraulic Research Institute
Journal of Hydraulic Engineering | Year: 2010

This note, using a three-dimensional model of river flow and sediment transport, examines the effect of the vertical resolution and the choice a nonequilibrium adaptation length Ls in predicting flow and sediment transport around groins in China's Yongding River. The results show that a fine vertical grid and nonequilibrium sediment transport model provide good predictions, especially on the river bed profile with an obvious main channel and flood plain. © 2010 ASCE.

Wu W.,China Institute of Water Resources and Hydropower Research | Wu W.,Beijing Hydraulic Research Institute | Yin S.,Beijing Hydraulic Research Institute | Liu H.,Beijing Hydraulic Research Institute | Chen H.,China University of Geosciences
Water Resources Management | Year: 2014

Increasing water shortages promote reclaimed water irrigation (RWI), which potentially causes additional contaminants in groundwater. The DRASTIC model has become an important tool to assess specific groundwater vulnerability. In this study, five parameters of the model were kept to calculated intrinsic vulnerability index (IVI). Aquifer media rating is calculated using the weighted average of ratings for all mediums instead of using the major medium rating, and the rating of the impact of vadose zone is adjusted for the clayey soils on the basis of their thickness. Subsequently, a single parameter sensitivity analysis is used to compute the effective weights of those five parameters. The Pearson's correlation coefficient between IVI and Nemerow's synthetical pollution Index (NI) of groundwater quality is significantly improved from 0.185 to 0.775 after four steps of revision. The RWI factor, Rrr, is introduced to assess specific vulnerability index (SVI) under RWI. The SVI decreases from east to west with the increases in depth to water, clayey soil thickness, and other factors. To manage contamination risk, the study area is divided into preferential zones, feasible zones and unfeasible zones for RWI planning and operation with suggested engineering measures. © 2014 Springer Science+Business Media Dordrecht.

Liang J.,CAS Research Center for Eco Environmental Sciences | Liang J.,Beijing Hydraulic Research Institute | Yang Q.,University of La Coruña | Yang Q.,Wuhan University | And 2 more authors.
Energy and Buildings | Year: 2011

The use of groundwater for cooling and heating purposes is of interest from both the economical and the ecological perspective. The groundwater heat pump (GWHP) system utilizes groundwater as alternative renewable and clean energy source for space heating and/or cooling, withdraws water from a production well, passes it through a heat exchanger and discharges the water into an injection well. By utilizing the relatively stable temperature of groundwater, GWHP system can achieve a higher coefficient of performance. Due to the utilization of groundwater stored in the aquifer, the assessment of the hydraulic capacity of the aquifer based on numerical groundwater models is always needed for the optimum design and the efficient performance of GWHP. In this paper, numerical methods of underground heat-water transfer, energy balance method and thermal storage method were presented to calculate the capacity of unit area of shallow groundwater aquifer. The model results indicate that the numerical method, which is based on performance efficiency of GWHP, represents the behaviour of groundwater pumping/recharging processes, and serves better than energy balance method and thermal storage method, in addition it has been proven itself that this method has the advantages of energy saving and environmental protection. The calculated capacity is positively related to aquifer thickness. It is found that it is easy for ground water recharge in alluvial and pluvial fan located at the piedmont, while the calculated capacity is relatively smaller compared with that of south-east plain where it is not easy for groundwater recharge. © 2011 Elsevier B.V. All rights reserved.

Ma N.,Dalian University of Technology | Ma N.,Beijing Hydraulic Research Institute | Zhang Y.,Dalian University of Technology | Quan X.,Dalian University of Technology | And 2 more authors.
Water Research | Year: 2010

Membrane filtration has been increasingly used for water treatment and wastewater reclamation in recent years. To further improve the effectiveness of membrane process and reduce membrane fouling, a highly reactive photocatalytic membrane, Ag-TiO2/hydroxiapiate (HAP, Ca10(PO4)6(OH)2)/Al2O3, was employed to realize microfiltration (MF) coupling photocatalysis for surface water treatment. The effectiveness on the potential of membrane was investigated by removing humic acid (HA) test under different feed total organic carbon (TOC), light intensity and transmembrane pressure (TMP). The HA removal and anti-fouling property of as-prepared membrane was improved under UV irradiation, likely due to photocatalytic degradation of foulants along with filtration simultaneously. Under given feed water composition, increasing the light intensity resulted in increased removal of HA from aqueous solution. However, a limiting TMP seems to exist beyond which the increased HA removal cannot be sustained. Fouling behavior analysis indicated that the transition in fouling mode from initial pore blocking to cake filtration occurred much slower as UV irradiated. Furthermore, a superior efficiency on removal of trace organic contaminants, as well as milder flux reduction, was presented from surface water treatment, which demonstrated that the integrated system with enhanced performance is foreseen as an emerging technique for water treatment. © 2010 Elsevier Ltd.

Ma N.,Nanyang Technological University | Ma N.,Beijing Hydraulic Research Institute | Wei J.,Nanyang Technological University | Liao R.,Beijing Hydraulic Research Institute | Tang C.Y.,Nanyang Technological University
Journal of Membrane Science | Year: 2012

Zeolite-polyamide thin film nanocomposite (TFN) membranes were prepared on a polysulfone (PSf) porous substrate tailored for forward osmosis (thin thickness, high porosity, and straight needle-like pores). The TFN membranes were characterized and evaluated in comparison with a thin film composite (TFC) membrane. The incorporation of NaY zeolite nanoparticles in the polyamide rejection layer significantly changed its separation properties. In the range of 0.02-0.1. wt./v% zeolite loading, the incorporation of zeolite-polyamide exhibited enhanced water permeability of membrane likely due to the porous nature of zeolite. However, further increase in zeolite loading led to a reduction in water permeability, possibly as a result of the formation of a thicker polyamide layer. The most permeable TFN membrane (TFN0.1, with 0.1. wt./v% zeolite loading) had a water permeability approximately 80% higher compared to the baseline TFC membrane. The FO water flux followed a similar trend to that of the membrane water permeability. Under all cases evaluated in the current study (0.5-2.0 NaCl draw solution, DI water and 10. mM NaCl feed solution, and both membrane orientations), the membrane TFN0.1 exhibited highest water flux (up to 50% improvement over the TFC membrane). To the best knowledge of the authors, this is the first report on zeolite-polyamide based TFN membranes for FO applications. © 2012 Elsevier B.V.

Yu Y.T.,Institute of Strategy and Policy Naval of Armament | Ding Y.,Beijing Sino Ocean JIYE Property Management CO. | Ding Z.X.,Beijing Hydraulic Research Institute
Applied Mechanics and Materials | Year: 2013

The sea-battlefield situation is dynamic and how efficient sea-battlefield situation assessment is a major problem facing operational decision support. According to research based on Bayesian networks Sea-battlefield situation assessment, first constructed sea-battlefield situation assessment Bayesian network; followed by specific assessment objectives, to simplify creating sub Bayesian assessment model; once again based on Bayesian network characteristics to determine each node probability formula; finally, according to the formula for solving the edge of the probability and the conditional probability of each node, sea-battlefield situation assessment. © (2013) Trans Tech Publications, Switzerland.

Qin C.-H.,China Institute of Water Resources and Hydropower Research | Gan H.,China Institute of Water Resources and Hydropower Research | Zhang X.-J.,Beijing Hydraulic Research Institute | Jia L.,China Institute of Water Resources and Hydropower Research
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

Based on the connotation analysis of the value of water resources, the theory and practice study for price of water resources were developed. The supply price of water resources should be composed of water resources fee, cost of supply and environment compensation fee for water. Demand price of water resources should be determined by economic value of water resources. Market price of water resources should be determined by provide price and demand price, and it could be evaluated by shadow price in non-marketization system. According to the equilibrium relation of water price, quantitative evaluation method for water resources fee was put forward. Based on the simplified CGE model and related methods, some key factors were quantitatively evaluated, such as shadow price, economic value, water resources fee, supply cost and environment compensation fee for water. The output of this study will provide theory support for pricing mechanism of water resources and practice support for pricing standard. The achievements are significant for practicing most strict water resources management, setting up price mechanism of water resources, allocating water resources by price lever.

Niu Y.,Beijing Hydraulic Research Institute | Liu H.,Beijing Hydraulic Research Institute | Wu W.,Beijing Hydraulic Research Institute | Yang S.,Beijing Hydraulic Research Institute
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

A large-scale weighing lysimeter was employed to study cucumber transpiration processes in solar greenhouse in Beijing. Based on the cucumber growing processes, the growing season was divided into three stages: flowering-setting, fruiting and later fruiting with stage transpiration 14.06 mm, 102.85 mm, and 30.84 mm, respectively. The cucumber seasonal transpiration was 147.74 mm and the seasonal average transpiration rate was 1.41 mm/d. The most sensitive factor to transpiration rate was net radiation followed by air relative humidity, pan evaporation, leaf area index (LAI), and air temperature in order. Three empirical models were also proposed for estimation of cucumber transpiration rate in solar greenhouse.

Wang D.-Y.,Beijing Hydraulic Research Institute
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings | Year: 2011

Underground Culvert construction always adjacent to existing pile foundation, it is an important problem how to ensure the security of the existing pile. Taking the Underground Culvert at West Ring Road of the South-North Water Transfer Project as an example, the 3D numerical simulation had been carried out and the stress deformation Law and the stability of the pile was studied. The results had shown that the Underground Culvert construction had little impact on the stress and the deformation of the pie, and working period does not endanger the viaduct's safety theoretically. The conclusions and suggestions are valuable for the engineering design and worth as references for the similar projects. © 2011 IEEE.

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